Boring-tool.



No. 654,861. Patented luly 3|, |900.

J. J. TYNAN. Y BORING TOUL.

(Application led Aug. 7, 1899.) (No Modal.) 2 Sheets-Sheet l.

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WITNESSES:

lo. s54,a6|. Patented my. 3|, |900.

J. J. TYNAN.

BORING TOUL.

(Application led Aug. 7, 1899.) (un Model.) 2 sheets-sheet 2.

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TH: "cams mins co.. muvo-LITRO.. WASHINGTON. o. c.

UNirD' STATES PATENT OFFICE.

VJOSEPH J. TYNAN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY MESNEASSIGNMENTIO THE PNEUMATIO TOOL IMPROVEMENT COMPANY, OF SAME PLAOEANDACAMD'EN, NEW JERSEY.

BORING-prooi..

srncrrrcarroiv forming part or Lettestratent No. 654,861, dated Jgiy 31,ieo. Application illed August 7, 18.99. Serial Ifo-726,405I (No model.)

To al?, wwnt it may concern:y i i Be it knownl that I,"JOSEPH J. .T'YNAIa citizen of the United States, residing in the city and county ofPhiladelphia, in the State of Pennsylvania, have invented certain newand useful Improvements in Boring-Tools', of which the following is aspecification.

My invention relates to a class of implements employed to cut boltholesand similar apertures, usually of considerable depth, into or throughmasses of wood, especially such as compose parts of the inner skins,decks, and girders of vessels.

It is the object of my invention to provide a simple and compact yetvery efficient iin-A plement of this character capable of doing' betterand quicker work than such devices as have heretofore been employed forthe pur# of the disk, and the plane of the guide edge,

pose.

In the accompanying drawings I show andA herein I describe, a good formof a conven-` ter, the head being diagrammatically indi-Il cated. e

Figure 5 is a central, vertical, sectional,

elevation of the device, section being sup# posed on the line 5 5 ofFigure 4,1.

Figure 6 is'a view in perspectiveof myim-4 gustment.`

proved cutter head.

Figure 7 is a view 1n vertical, sectional,i

elevation of the cutter head, the cutter shaft,

a handle, and a supporting and guiding mechanism employed in connectionwith the cutter shaft. i

Similar letters of reference indicate corre-rl y i one portion andtheother upon the remaining spending parts.

In the drawings, A is thev cutter shaft upon the threaded outerextremity of which is mounted a shank O'of the cutter head B.

headv The head B consists conveniently of a disk like body carried byand conveniently integral with respect to the shank C, said head beingprovided with a pair of cutter slots b extending respectively fromopposing edges of the head t-angentially inward for such distance as maybe necessary according to the breadth of the cutters employed.

The upper face of the cutter head is fashioned to provide inclines orbit seats, which respectively extend each from an edge of a cutter slotupward for any desired distance,

. and, preferably as shown in the drawings, to

the edge of the disk like body of the head, the inner edge of eachincline being dened by a vertical wall or rib b', the body of which fromtop to bottoni .is `conveniently of the full normal thickness orvertical dimensions b2, of which is tangentially disposed'with respectto the'shank` C. r

The inclines are, therefore, in plan, semisegmental, so to speak. Y D Eare cutters, bits or knives, each approximately of semi-segmentaloutline corresponding to the plan of the inclines, and each mounted uponan incline with its cutting i edge protruding through the adjacent slotvand below the plane of the lower face of the bodyof the head.

When in this position the inner edges of the cutters abut against theguide edges b2, and the curved edges of said cutters approXimatelycoincide with the curved outer face of l the cutter head.

F F are screws which pass through suitable slots in the cutters and downinto the substance `of the cutter head, and which serve to secure thecutters in different positions of adr The cutter D and the cutter E, inthe revolution ofmthe head, togetherl cutor operate upon a circular zoneor space equal in breadth to the breadth of one of said cutter`s,"s`aidjcutters being provided with apportioned cutp. ting edges, so that4 onecutter operates upon portion of the circular space or zone to be cut.

t With such object in view the cutting end ofthe cutter E is providedwith the two cutting portions e at the respective sideportions IOO ofthe other cutter.

The cutters are of suchform and arrangement that vertical planescoinciding with shank'of the cutter head, with the 4result that as saidcutters are swept aroundthe circle they-describe in the operation of theimplement, they present an inclined edge, so to speak, tc the masses ofwood or material they encounter, so that they effect a drawingY cut uponthe wood or material, the operation of the apparatus being therebyrendered proportionately easier.

G isa recessor slot formed in 'the outer edge of the head in the regionb', said slot having an undercut wall g, (Figure 3.)

H is a knife haft having a pair of inclined side edges, which haft isseated within said recess with one of its inclined edges extendsvl ingbeneath the edge g, said haft terminating at itslower end in a knife h(Figure 2) which projects below the plane of the lower face of the head.

J isa holding block with an inclined edge, y mountedin the recess G, andextending across the remaining space thereof from the edge of' the haftto the edge of the recess, the edge of said block overhangingthe'adjacent edge of the haft.

Screws secure said holding block in position, and, through said holdingblock firmly lock the knife and knife haft against lateral displacement.

K isa screw entered in a suitably tapped opening in the upper face ofthe cutter head. and so located that the head of said screw presentsagainst the upper end of the knife haft, the arrangement being such thatby. the adjustment of said screw in its tapped opening saidknife may beset at any desired position, of vertical adjustment.

In the operation of cutter heads of this general character where thecutter blades operate at an angle of only about forty-five degrees fromthe horizon, against a surface which is itself approximately horizontal,and particularly when operating upon aA fibrous material such as wood,the tendency is to form a hole the side of which. will, owing to thetearing of the bers, be pitted or uneven.

VAs will be understood, however, by the provisionof the auxiliary knifeH, located Vat the outer edge of the' cutter head, and with its cuttingedge disposed vertically with respect to the planev of the surfaceoperated upon by the cutters D E, not only -will the liole f v cut bythe instrument be rendered smoothbut tation.

Y it, the cu't splinterspassingu p over the upper faces of the cutters;thereis Vno provision ordinarily in the use of cutters ofthis generaltype for the separation of the masses of wood excavated by the inclinedcutters from the block operated upon along a line coinciding with theboundary of the hole formed, so that the material excavated ,by theinclined cuttheir cutting edges aretangential to the ters is merelytorn, so'to speak by the outer ends ofi-the cutting'ed'ges from .thebody of thematerial acted upon.

The auxiliary knife H, however; cutting throughthe materialoperatedupon, upon a line coinciding with the outline of thecutter head,separates the material to be cutinto and excavated by the cuttersD E,from the body of the timber-operated upon, and thereby, by thesubstitution of the cutting actionof said auxiliary knifek for thetearingaction which must take place in the absence of said knife,

renders more easy theoperation of .the tool and occasions the formationof at smooth hole instead of a ragged one. Y

The vertically disposed knife mounted on the periphery of the cuttinghead is of special utility in connection with the arrangement.

of cutters hereinbefore described, inasmuch as one of said cutters has ablankY space or recess at t-he outer portionof its cutting edge, andtherefore there is a greater tendency on the part of the inclinedcutters, (in the'absence IOO of the vertically disposedknife) to fail,by

reason of such recess,.to form a smooth and cleanly cut hole. l

Manifestly the arrangement of inclined cutters disclosed, having.alternatef cutting portions or recesses and blank spaces the cuttingportions of one blade acting upon portions passed over by the blankspaces of the. other blade, constitutes an improvement upon cut# terblades as heretofore formed and arranged.

In cutters of thisgeneral character as heretofore arranged one blade isapt to project below the other and do all the. cutting, the othersimplyfollowingin its path and remain- IIO . ing idle, the strain comingtherefore on one part of the tool, at one side of its axis of rc- In myimproved cutter each'blade takes its own portion of the work, theYstrain isfdistributed equally on both sides of the instrument and thedevice operates more smoothly and uniformly. Y

`In order to provide for the entrance of the tool within the substanceand as aguide for its operation, I provide an auger bit L, Figure 5,which I mount in the manner shown or in any preferred manner withinthemouth of the shank C.

This is my preferred expedient.. If. I so desire I may resort to` asubstitute `for this expedient, such las is shown in Figure 7,

namelya x'ed guide S in the center of a previously formed hole ofdiameter equal to the shank C, which guide extendsV up within the hollowinterior of the cutter shaft.

I prefer however in some cases to employ the auger bit L shown in Figure5 for the reason that in its use no previously formed hole is necessary.

The cutter shaft A is shown, as provided with a sleeve M mounted forrotation within one arm of a frame elbow N, said sleeve being secured tothe shaft by a set screw m which passes through it into a key seat inthe cutter shaft and also through a collar M mounted upon the lower endof said sleeve. The upper end of said sleeve is provided with a bevelgear M.

The bevel gear and collar confine the sleeve in place within the bore ofthe frame elbow.

O is a driving shaft in communication, through any desired means, with asource of power, which shaft extends through the other arm of the frameelbow and is equipped as to its inner end with a bevel O in mesh withthe bevel gear rst mentioned.

P is a collar, mounted and secured on said shaft O, which with the gearO maintains said shaft against longitudinal movement with respect to theframe elbow.

By the arrangement described the frame elbow, carrying the cutter shaftand head, may be rotated with respect to the shaft O,

and said cutter head carried to different positions in a planeperpendicular to said shaft O, or, said frame elbow, carrying the shaftO, fnay be rotated upon the sleeve M to carry the outer end of the shaftO to whatever position within its range of move-ment, may be mostconvenient to connect it with a source of power. The apparatus may,therefore, be veryconveniently employed in corners and places difficultof access with boring implements of ordinary construction.

To advance the cutter shaft and head, I provide the shaft with a handleQ connected to its outer endby a swivel consisting of a screw q theouter unthreaded portion of which passes through an unthreaded openingin the handle and the inner threaded portion of which engages in atapped opening in the end of the shaft.

The portion of the handle which presents toward the shaft is shown asformed as a fiat operating face Q and the outer end of the shaft asrecessed to form a ballrace R within which are a series of balls R'which ease the friction between the handle and the shaft in the rapidrevolution of the latter.

Having thus described my invention, I

claim and desire to. secure by Letters Pat= ent- 1. A cutter for boringcylindrical holes, consisting of a disk head having approximately radialslots, symmetrical bit seats formed by inclines leading to said slots,each at its lower portion of the width of the circumferential path orarea operated upon by the bits, cutters orbits mounted on the inclinesand presenting through said slots and conforming to the seats indimensions, each bit being as to its front edge provided with ,a blankspace and a cutting edge, the cutting edge of one bit arranged tooperate upon the regionpassed over by the blank space of the other, andthe cutting edges of said bits being straight, substantially as setforth.

t 2. A cutter for boring cylindrical holes, con

ters or bits mounted on the inclines and pre senting through said slotsand conforming to the seats in dimensions, each bit being as to itsfront edge provided with a blank space and a cutting edge, the cuttingedge of one bit arranged to operate upon the region passed over by theblank space of the other, the cutting edges of said bits being straight,and a vertically disposed cutting knife mounted upon the periphery ofthedisk head and proj ecting below the lower face of the same,substantially as set forth.

3. A cutter for boring cylindrical holes, consisting of a disk headhaving approximately radial slots, symmetrical bit seats formed byinclines leading to said slots, each at its lower portion of the widthof the circumferential path or area operated upon by the bits, cuttersor bits mounted on the inclines and pre senting through said slots andconforming to the seats in dimensions, each bit being as to its frontedge provided with a blank space and a cutting edge, the cuttingy edgeof one bit arranged to operate upon the region passed over by the blankspace of the other, the cutting edges of said bits being straight, anda` vertically disposed cutting knife adj ustably mounted upon theperiphery of the disk head and projecting below the lower face of thesame, substantially asset forth.

IOO

IIO

In testimony that I claim the foregoing as

